[ANN] Reforging the ReScript Build System

Announcements
1

We wrote a blog post about the new build system in v12: Reforging the ReScript Build System | ReScript Blog

Feel free to ask any questions you have about it.

Happy building!

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2

Thanks for sharing some insights about rewatch. Very interesting.
Compared to typescript, monorepos work like a breeze now.

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3

That’s an interesting observation. What makes it harder in TS? Or is it just the house of cards of types that you build that make TS slow?

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It’s more about the configuration than the compilation speed.
Probably caused by many totally different projects, I have no idea about the best way to set these up.

  • tsc vs tsc --build?
  • Using the incremental flag or not?
  • Using path aliases?
  • In some projects I have to import files with the extension import { ... } from "./something.js", in some other projects I don’t.
  • Should I use nx, turborepo, lerna, …?

I don’t like to say “skill issue”, but yeah… it’s a skill issue.

In rescript, I just have to add the dependencies to my rescript.json. Done.

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5

I use rewatch with a ReScript 11 monorepo for some time already and in the context of a monorepo it’s a game changer! A couple of seconds + less than 512MB RAM (haven’t tried to push lower) to watch/build all the ReScript code and then multitude more time + 2GB of RAM to compile the remaining 10% of codebase with tsc.

What I was missing a little is the bulk code code-formatting across the whole code base, but now it’s coming with ReScript 12 :heart:

Many thanks to people involved for the hard work. Really-really appreciate this :bowing_man:

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